#include <stdlib.h>
#include <unistd.h>
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <stdio.h>
#include <time.h>
#include <map>

using std::ifstream;
using std::ofstream;
using std::string;
using std::vector;
using std::map;
using std::endl;
using std::cout;
using std::cin;

using std::make_pair;
